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JAMB Physics 1992 Question 8

Question 8

Friction

In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is

Diagram for this question
  1. A.m1/m2
  2. B.m1g/m2
  3. C.m2/m1
  4. D.m2g/m1
Show the answer and explanation

Answer: C (m2/m1)

Explanation

At the point of sliding, the pull m2g equals the limiting friction μm1g, so μ = m2/m1.